Here are some test shots from a roll of Kodak HIE high speed b&w infrared film that expired in 1990. I think it’s been frozen since purchase but I can’t be sure so I bracketed my exposures widely erring on the overexposure side which turned out not to be necessary. I rated the film at ISO 10 and used a B+W 093 filter which is around 5 stops in density which is too dense to look through so for that reason I decided to use a rangefinder camera which meant I wouldn’t need to keep removing the filter to compose my shots. Out came my M2.